Speed of light might be variable

[davepoth]

http://forums.theregister.co.uk/forum/1/2016/11/25...

Any thoughts on this?

Intuitively it's always struck me as a more reasonable explanation for some of the observations of the universe we've made (inflation, distant galaxies seem to be moving away faster) but it does break some of our basic understandings of how the universe works. If c isn't constant then what's behind c?

[Evanivitch]

Speed of light in a vacuum.

Light has always varied in speed when through a substance.

[Monty Python]

Speed of light is constant, it's space that's stretching.

[annodomini2]

Monty Python said:

Speed of light is constant, it's space that's stretching.

I've heard it postulated that the speed of light may be inversely proportional to the expansion of the universe, i.e. potentially the universe expansion is constant, but the speed of light has dropped over time.

I have no reference or evidence, but it would make for some interesting behaviour if true.

[CAPP0]

Most galaxies will allow +/- 10% + 2 light years.

[Higgs boson]

CAPP0 said:

Most galaxies will allow +/- 10% + 2 light years.

(if you'd left out the minus)

[K12beano]

Higgs boson said:

CAPP0 said:

Most galaxies will allow +/- 10% + 2 light years.

(if you'd left out the minus)

I thought they were all getting stricter these days....

[Derek Smith]

I've always thought it was more sort of advisory, just like any theory.

[K12beano]

Derek Smith said:

I've always thought it was more sort of advisory, just like any theory.

"Them's mooorrre sort-of....


.....guidelines"

[/PiratesoftheCaribbean]

[Halmyre]

K12beano said:

Derek Smith said:

I've always thought it was more sort of advisory, just like any theory.

"Them's mooorrre sort-of....


.....guidelines"

[/PiratesoftheCaribbean]

I think they nicked that from Terry Pratchett. Although I don't suppose he was the first to use it either.